Millions of people across parts of California, Oregon, and Washington are under urgent heat alerts as the National Weather Service (NWS) warns of “lethal temperatures” and elevated overnight heat that could pose serious health risks.
Where the Heat Warnings Are in Place
An Extreme Heat Warning is in effect from mid-Sunday morning to Tuesday evening across large areas of:
Northern California, including the Sacramento Valley, Shasta County, and the surrounding foothills.
The Portland, Oregon metro area, extending into southwest Washington, including Vancouver and the Columbia River Gorge.
What Conditions People Should Expect
The NWS says that the region will experience prolonged, “dangerously hot conditions” with little overnight relief:
While summer temperatures in inland California can regularly exceed 100 F, this level of prolonged heat — especially combined with warm nights — severely increases health risks.